Correction: Inland area schools that previously won boys basketball state championships was listed incorrectly in earlier versions of this post.

CORONA — In what sport is the ultimate prize awarded to the winner of a fifth game when one team has already won the first four?

Welcome to the CIF-State Southern California Regional boys basketball championships, where Big VIII League rivals Corona Centennial and Eastvale Roosevelt will play for an unprecedented fifth time this season.

It doesn’t matter that Roosevelt has won the previous four games when they take the floor Saturday at 2 p.m. at the Walter Pyramid on the campus of Long Beach State University. This game is all that matters for a regional title and a spot in next Friday’s CIF-State Division I championship game.

“Beating them four times, none of that matters at all,” Roosevelt senior guard Jemarl Baker said. “It’s about this last game right now. It’s about this game. The four times, it doesn’t matter at all.”

While this is Roosevelt’s first trip to a regional final, it is the fourth time in the last seven seasons Centennial has been in this position, losing to Santa Ana Mater Dei in 2011, beating Chino Hills in 2014, and losing to Chino Hills in 2015.

Since the CIF instituted state championships for basketball in 1981, the Inland area has had five boys teams reach a state final. Centennial lost to Danville Monte Vista in the Division I final in 2014. Banning (1982), Riverside King (2002), Rialto Eisenhower (2009) and Fontana Summit (2011) also had boys qualifiers over the years. King and Eisenhower each won titles in Division II. None has gone more than once.

“It’s crazy that the Division I Southern California Regional champion — that’s San Diego to Fresno — is going to come out of Corona-Norco,” Centennial coach Josh Giles said. “The kids that are in and around Centennial and Roosevelt, that speaks to the talent level here. That’s pretty impressive.”

For Roosevelt, the No. 2 seed in the regional bracket, it’s one more chance to prove they are they superior team in this rivalry, superior for the first time in program history.

The Mustangs got their first share of the league title last year, splitting Big VIII games with the Huskies. This year, Roosevelt proved to be the dominant team, winning in late December at the Damien holiday tournament, sweeping both league games, and winning in the CIF-Southern Section Open Division consolation bracket.

“It’s not ‘Oh, we’ve beaten them four times already, it’s going to be a cakewalk,’ because we know it’s not,” Roosevelt senior wing Matt Mitchell said. “We’re going into this thing, it’s going to be a dogfight.”

“You’re in a regional final, I think everybody is going to feel pressure,” Giles said. “People want to word it that way because they beat us four times. To me, 0-4, 4-0 I think in a game of this magnitude probably gets thrown out the window. I might be a little bit more concerned if all four games we lost by 30. But that’s not been the case. They’ve all been games that came down to the wire. We didn’t finish them off and they did.”

For Centennial, the No. 4 seed, it’s a chance at redemption and to become the first Inland area program to qualify for a state championship game for a second time, and only the third boys team from Riverside County to play in a state final.

“It’s pretty big because I was in one my sophomore year and I didn’t play as well as I wanted to,” Centennial center Jalen Hill said. “This one I can kind of redeem myself. I felt like I let my team down a little bit sophomore year. This time, I’m trying to get a state championship, that would mean me playing really big in this game. I’m just trying to do that for my team.”

The Mustangs are built around two stars, Baker, a 6-foot-4 shooting guard heading to Cal, and the Cal State Fullerton-bound Mitchell, who, at 6-5, can play all five positions on the floor. Baker averages 17.3 points per game, 4.3 assists and has made 91 3-pointers. Mitchell averages 25.2 points, 9.3 rebounds and has made 61 3s.

“Great players usually make great plays and they have two guys that make great plays, two great players,” Giles said. “They are going to make shots, they’re going to make great plays and we have to weather that storm.”

Aside from those two seniors, the Mustangs came into the season young and inexperienced. Junior bigs Jared Williams and David Agba have developed into strong players in the paint and juniors Brennen Wade, freshman Brandon Porter and seniors Tyler Goodlow, John Davis and Xavier Preston have all filled valuable roles.

“Quite a few of them have stepped up a lot and helped us big time,” Mitchell said. “Without them, we’re not here.”

The Huskies were built around Hill, a 6-10 senior averaging 20 points and 13 rebounds who is headed to UCLA, Gio Nelson, a 6-4 guard headed to UC Davis, and a mix of seniors (guards Isom Butler and Paul Viela), youngsters (forward Legend Stamps, a sophomore transfer from Etiwanda, and Jaylen Clark, a 6-4 freshman guard), and developing role players (including junior Jalen Jernigan, and sophomores Allan McBride and Bobby Oros among them).

But midway through league, Nelson, averaging 15 points and nearly 5 rebounds per game, suffered a knee injury that would end his season. Around the same time, DJ Davis, a freshman guard who had shattered 3-point shooting records at Riverside Poly, transferred over in time to play the last four games of the regular season.

While Nelson was a physical, athletic guard, Davis is a roughly six inches shorter but with seemingly unlimited range.

“This could maybe be the least likely of teams we’ve had over the last couple of years to be in this situation,” Giles said. “From where we started to losing Gio, a player transfers in mid-season. That could tear a team apart. The guys on our team have handled DJ transferring in so maturely. They’ve handled it like pros.

“Losing Gio didn’t make us better. And we’ve had to overcome all these things. To me and all the guys on the team, we’re looking at it like this could be one heck of a story. Damien beat us pretty well. To go back and win, that’s huge. Now you get to play for a regional final against a team that’s had our number all year. It’s an opportunity for a heck of a story.”